Direct Antigen Presentation Occurring During Allogeneic Graft Rejection Occurs When

question 4

Multiple Choice

Direct antigen presentation occurring during allogeneic graft rejection occurs when:

• A) Donor APCs present antigen to the donor T cells
• B) A recipient's T cells recognize donor cells as foreign
• C) Donor antibodies bind to recipient cell surface molecules
• D) A recipient's T cells recognize foreign antigen processed on the recipient's APCs

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Definitions:

Higher Order Conditioning

A classical conditioning process where a conditioned stimulus is paired with a new neutral stimulus, creating a second (often weaker) conditioned stimulus.

Response Generalization

The process by which a conditioned response starts occurring in response to stimuli that are similar but not identical to the original conditioned stimulus.

Shaping

A method used in operant conditioning to gradually guide behavior towards a desired response through successive approximations.

Operant Conditioning

A system of learning whereby the dynamism of a behavior is managed through the distribution of rewards or the assignment of penalties.